<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div class="app">
      <div ref="msgDiv">{{msg}}</div>
      <div v-if="msg1">Message got outside $nextTick: {{msg1}}</div>
      <div v-if="msg2">Message got inside $nextTick: {{msg2}}</div>
      <div v-if="msg3">Message got outside $nextTick: {{msg3}}</div>
      <button @click="changeMsg">Change the Message</button>
    </div>
    <script src="./vue.js"></script>
    <script>
      new Vue({
        el: ".app",
        data: {
          msg: "Hello Vue.",
          msg1: "",
          msg2: "",
          msg3: "",
        },
        methods: {
          changeMsg() {
            this.msg = "Hello world.";
            this.msg1 = this.$refs.msgDiv.innerHTML; //在此之前原本就是hello vue
            this.$nextTick(() => {
              this.msg2 = this.$refs.msgDiv.innerHTML;
            });
            this.msg3 = this.$refs.msgDiv.innerHTML; //在此之前原本就是hello vue
          },
        },
      });
    </script>
  </body>
</html>
